This conclusion is driven by the observational requirement for a
soft X-ray component in the late state decline data. This is weak,
but significantly present in all but the last three datasets (assuming
that the absorption column remains constant: [1]}).
It combines a low luminosity with a fairly high (soft X-ray)
temperature, which leads to the derived small radius and low mass
accretion rate. This low mass accretion rate is then much smaller
than that required to power the observed hard X-ray emission.
